Laser hair removal uses the "selective photothermal effect" of laser, and the laser with a specific wavelength passes through the epidermis and directly irradiates the hair follicle. HR808 laser can penetrate the skin surface to reach the hair follicle at the root of hair, and the light energy is absorbed and converted into heat energy that destroys the hair follicle tissue, so that the hair loses its regeneration ability without damaging the surrounding tissues, and the pain is mild.